Machine tool guideway, hardness test of automobile chassis, installed mechanical or permanent assembly parts, mold cavity, test space, very small workpiece, large workpiece, large range of measurement parts, rapid inspection of pressure vessels, steam turbine generators and other equipment failure Analyze the material of the bearing and other parts production line metal material warehouse. Distinguish the quality control requirements of the heat-treated workpiece. The normal original record of the test results can realize the mutual conversion and hardness between the six hardnesses (HL, HRB, HRC, HB, HV, HS). The mutual conversion with the tensile strength can display the measured value, the average value, the date, the impact direction, the number of tests, the test material, the hardness system, and the like, and the display information is rich.